Method for positioning a liner on a tubular member in a well bore with a retrievable pack off bushing therebetween

ABSTRACT

A method and apparatus for positioning and bonding a liner in a casing in a well bore wherein a pack off bushing is provided between the liner and the well string on which the liner is lowered into the well bore for discharge of a bonding agent through the well string and around the liner in the well bore. The seal or pack off bushing is constructed and arranged so that it may be retrieved after the positioning and bonding operations are completed along with the well string upon which the liner is initially lowered into the well bore.



1. A METHOD OF POSITIONING A LINER ON A WELL STRING IN A WELL BORECOMPRISING THE STEPS OF: A. SECURING THE LINER ON THE WELL STRING; B.LOCKING A SEAL BUSHING IN POSITION BETWEEN THE LINER AND THE WELL STRINGTO SEAL OFF THEREBETWEEN; C. LOWERING THE WELL STRING AND LINER TO ADESIRED POSITION IN THE WELL BORE; D. ROTATING THE WELL STRING RELATIVETO THE LINER TO DISENGAGE THE LINER FROM THE WELL STRING:
 2. A method ofpositioning a liner on a well string in a well bore comprising the stepsof: a. securing the liner on the well string; b. locking a seal bushingin position between the liner and the well string to seal offtherebetween; c. lowering the well string and liner to a desiredposition in the well bore; d. rotating the well string relative to theliner to disengage the liner from the well string; e. discharing abonding agent from the well string and into the well bore around theliner; and f. thereafter withdrawing the well string longitudinally ofthe liner to unlock the seal bushing, and g. retrieving the well stringand seal bushing from the well bore.
 3. A method of sealing between aliner and well string during bonding operations in a well bore andthereafter retrieving the seal from the well bore comprising the stepsof: a. locking a seal bushing in position between the well string andliner to seal off therebetween; b. lowering the well string and linerinto the well bore; c. disengaging the well string from the liner byrelative rotation therebetween while maintaining the seal locked inposition therebetween; d. discharging a bonding agent through the wellstring and into the well bore around the liner to bond it in the wellbore; and e. thereafter moving the well string longitudinally of theliner to unlock the seal bushing and retrieve it along the well stringfrom the well bore.
 4. A method of sealing between a liner and wellstring during bonding operations in a well bore and thereafterretrieving the seal from the well bore comprising the steps of: a.locking a seal bushing in position between the well string and liner toseal off therebetween; b. lowering the well string and liner into thewell bore; c. disengaging the well string from the liner by relativerotation therebetween while maintaining the seal locked in positiontherebetween; d. discharging a bonding agent through the well string andinto the well bore around the liner to bond it in the well bore; and e.thereafter moving the well string longitudinally of the liner to engageand unlock the seal bushing and retrieve it along with the well stringfrom the well bore.
 5. A method of positioning a liner with a hangerthereon in a well bore casing comprising the steps of: a. securing theliner with the hanger thereon on a tubular member whereby the liner andtubular member may be disconnected from each other upon relativerotation therebetween; b. locking a seal bushing in position between thetubular member and liner to seal off therebetween; c. lowering thetubUlar member, liner and hanger thereon in the well bore to a desiredposition; d. expanding the hanger into locking engagement with the wellbore casing to support the liner thereon; e. disengaging the tubularmember from the liner by relative rotation therebetween whilemaintaining the seal locked in position therebetween; f. discharging abonding agent through the tubular member and into the well bore aroundthe liner; and g. thereafter moving the tubular member longitudinally ofthe liner to unlock the seal bushing and retrieve it along with thetubular member from the well bore.
 6. A method of positioning a linerwith a hanger thereon in a well bore casing comprising the steps of: a.securing the liner with the hanger thereon on a tubular member wherebythe liner and tubular member may be disconnected from each other uponrelative rotation therebetween; b. locking a seal bushing in positionbetween the tubular member and liner to seal off therebetween; c.lowering the tubular member, liner and hanger thereon in the well boreto a desired position; d. expanding the hanger into locking engagementwith the well bore casing to support the liner thereon; e. disengagingthe tubular member from the liner by relative rotation therebetweenwhile maintaining the seal locked in position therebetween; f.discharging a bonding agent through the tubular member and into the wellbore around the liner; and g. thereafter moving the tubular memberlongitudinally of the liner to engage and unlock the seal bushing andretrieve it along with the tubular member from the well bore.